Recent exciting discovery! An American Chronometer Maker & Inventor of the "Nautical Watch"
Robert Leslie Nautical Watch
Robert Leslie Movement
Early American Watchmakers
Robert Leslie is best known as the principal in the Philadelphia firm Leslie & Price. However, few collectors know that he made both clocks and watches for Thomas Jefferson, was commissioned to make Jefferson's “Great Clock” at Monticello, and was in the forefront of invention in Philadelphia during the 1790's. In fact, Robert Leslie was awarded the first clock and the first watch patents in America, effective January, 1787, signed by George Washington. He received additional patents in both America and in England that further evidence his work on some of the greatest challenges in horology at the time including constant force and chronometer escapements, pendent winding for watches, and torsion pendulums for clocks. Leslie relocated to London after a dispute with the Philadelphia clock and watch guild where he manufactured his inventions in partnership with Joseph Dodds, and supplied his shops in London, Philadelphia, and Baltimore with clocks and watches.
Leslie called one of his 1793 patented inventions the “Nautical Watch” which was intended to assist navigation at sea. This sophisticated timekeeper was the first two time-zone "captains" pocket watch made, and very likely the first watch movement designed by an American. By the greatest of luck, a surviving example was discovered in rural southwest Virginia in 2012. Nautical Watch #5, shown above, is in its original wooden shipping box and was presumably manufactured as a salesman's sample to generate orders. It is configured with different hand styles and both front and rear winding to demonstrate the ways it could be ordered, and was also pre-tapped to allow easy installation of Leslie's patented pendent-wind invention. The movement has a going barrel (no fusee) and duplex escapement, although we know from recent research that it was also available with Leslie's chronometer escapement and temperature compensation. “No 5 Leslie’s Patent” is printed on the dial. The movement signature plate is engraved “Brearley, Philadelphia.” James Brearley is a listed Philadelphia maker and Leslie associate who apparently retailed Robert Leslie’s clocks and watches.
An article about this important clock and watchmaker was published in the 2018 January/February and March/April NAWCC Watch & Clock Bulletin
Additional References and recommended reading:
Catherine Hollan, Philadelphia Silversmiths and Related Artisans to 1861, Hollan Press, Missouri, 2013
Richard Newman, Robert Leslie, The Greatest American Watch and Clock Maker Every Forgotten, NAWCC Watch & Clock Bulletin, No. 431 (January/February 2018), pp. 69-88, and No. 432 (March/April 2018), pp. 149-163